Mode equation 3 / (2x) = 1 / (x + 3)

Mode equation 3 / (2x) = 1 / (x + 3)

Go to the denominator first: multiply both sides by the simplest common denominator 2x (x + 3)
It is reduced to 3x + 9 = 2x
X = - 9

The eighth grade students visited the Agricultural Science Institute, which is 15 kilometers away from the school. Some of the students rode bicycles first. After 40 minutes, the rest of the students set out by car. As a result, they both arrived at the same time?

Suppose the speed of cycling is x km / h, 15x = 153x + 4060, and the solution is x = 15. After the test, x = 15 is the solution of the equation. Answer: the speed of cycling students is 15 km / h

Given that the image of a function of degree passes through points (- 2, - 2) and (2,4), (1) find the analytic expression of the function. (2) find the coordinates of the intersection of the image of the function and the Y axis

(1) Let the analytic expression of the function be y = KX + B, according to the meaning of the question: - 2K + B = - 22K + B = 4, the solution is: k = 32B = 1, then the analytic expression of the function is y = 32x + 1; (2) in y = 32x + 1, let x = 0, the solution is y = 1, so the intersection coordinates of the function and the Y axis are (0, 1)